package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.entity.Employee;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面,实现公共字段自动填充
 */


@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut(" execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /**
     * 前置通知,在通知中进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void doBeforeAutoFill(JoinPoint joinPoint) {
        log.info("执行公共字段自动填充");
//        获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解
        OperationType operationType = autoFill.value();//获得数据库操作类型
        log.info("数据库操作类型：{}", operationType);

//        或得到当前被拦截的方法参数 ----实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];
        log.info("实体对象：{}", entity);
        if (entity == null) {
            return;
        }
//        准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
//        根据操作类型进行赋值
        if (operationType.equals(OperationType.INSERT)) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                setCreateTime.setAccessible(true);
                setCreateUser.setAccessible(true);
                setUpdateTime.setAccessible(true);
                setUpdateUser.setAccessible(true);
//              通过反射为对象属性赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationType.equals(OperationType.UPDATE)) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                setUpdateTime.setAccessible(true);
//              通过反射为对象属性赋值
                setUpdateUser.setAccessible(true);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

/*// 我觉得代码提示出来的更优雅  好吧,其实也一般般
 if (entity instanceof Employee) {
            Employee employee = (Employee) entity;
            if (operationType.equals(OperationType.INSERT)) {
                employee.setCreateUser(BaseContext.getCurrentId());
                employee.setCreateTime(LocalDateTime.now());
            } else if (operationType.equals(OperationType.UPDATE)) {
                employee.setUpdateUser(BaseContext.getCurrentId());
                employee.setUpdateTime(LocalDateTime.now());
            }
        }*/
    }
}
